Full Idea
The fact that two apparently fruitful mathematical themes turn out to coincide makes it all the more likely that they're tracking a genuine strain of mathematical depth.
Gist of Idea
If two mathematical themes coincide, that suggest a single deep truth
Source
Penelope Maddy (Defending the Axioms [2011], 5.3ii)
Book Reference
Maddy,Penelope: 'Defending the Axioms' [OUP 2013], p.129